Polymeric light emitting substance and polymer light emitting device using the same

A polymeric light emitting substance having a polystyrene reduced number-average molecular weight of from 103 to 108 wherein said light emitting substance has a metal complex structure showing light emission from the triplet excited state at least at one of the ends of the main chain, wherein the main chain comprises a conjugated polymer,

• and the metal complex structure is represented by the below formula (6):
• wherein M represents a metal atom having an atomic number of 50 or more and showing a possibility of the intersystem crossing between the singlet state and the triplet state in this complex by a spin-orbital mutual action;
• Ar represents a ligand bonded to M, via one or more of a nitrogen atom, an oxygen atom, a carbon atom, a sulfur atom and a phosphorus atom, with bonding to a polymer at an arbitrary bonding position of the ligand;
• L represents a hydrogen atom, a hydrocarbon group having 1 to 10 carbon atoms, a carboxylate group having 1 to 10 carbon atoms, a diketonate group having 1 to 10 carbon atoms, a halogen atom, an amide group, an imide group, an alkoxide group, an alkylmercapto group, a carbonyl ligand, an arylene ligand, an alkene ligand, an alkyne ligand, an amine ligand, an imine ligand, a nitrile ligand, an isonitrile ligand, a phosphine ligand, a phosphine oxide ligand, a phosphite ligand, an ether ligand, a sulfone ligand, a sulfoxide ligand, a sulfide ligand or a heterocyclic compound group;
• m represents an integer of 1 to 5;
• and o represents an integer of 0 to 5, wherein M is a rhenium atom, osmium atom, iridium atom, platinum atom or gold atom,
• wherein the polymeric light emitting substance comprises one or more repeating units selected from the group consisting of the general formulas (1), (2) and (5) and one or more repeating units having a metal complex structure showing light emission from the triplet excited state, and
• the amount of the repeating units having a metal complex structure showing light emission from the triplet excited state is 0.01 mol % or more and 10 mol % or less based on the total amount of the repeating units of the general formulas (1), (2) and (5) and the repeating units having a metal complex structures showing light emission from the triplet excited state,
• wherein Ar1 represents an arylene group or a divalent heterocyclic compound group;
• R1 and R2 each independently represent a hydrogen atom, an alkyl group, an aryl group, a monovalent heterocyclic compound group or a cyano group;
• and n represents 0 or 1;
• wherein Ar2 and Ar3 each independently represents an arylene group, or a divalent heterocyclic compound group;
• Ar2 does not cross-link to Ar3;
• R11 represents an alkyl group, an aryl group, a mono-valent heterocyclic compound group, or a group represented by the below formula (3) or (4);
• the symbol t is an integer from 1 to 4;
• wherein Ar4 is an arylene group or a divalent heterocyclic compound group;
• R12 represents a hydrogen atom, an alkyl group, an aryl group, a mono-valent heterocyclic group, or a group represented by the below formula (4);
• Z1 represents —CR13═CR14— or —C≡C—;
• R13 and R14 each independently represents a hydrogen atom, an alkyl group, an aryl group, a mono-valent heterocyclic group, or a cyano group;
• the symbol u is an integer from 0 to 2;
• wherein Ar5 and Ar6 each independently represents an arylene group or a divalent heterocyclic compound group;
• R15 represents an alkyl group, an aryl group, or a mono-valent heterocyclic group;
• and the symbol v is an integer from 1 to 4;
• wherein R11 means the same as above;
• R18 and R19 each independently represents substituents on aromatic ring of a halogen atom, an alkyl group, an alkenyl group, an aralkyl group, an arylthio group, an arylalkenyl group, a cyclic alkenyl group, an alkoxy group, an aryloxy group, an alkyloxy carbonyl group, an aralkyloxy carbonyl group, an aryloxy carbonyl group, an aryl group, or a mono-valent heterocyclic group;
• the symbols a and b each independently represent an integer from 0 to 3;
• and when a or b is 2 or more, R18 and R19 are the same or different mutually, which may be connected to form a ring.